Exposure Controls - Teledyne Linea 2K CL User Manual

Exposure Controls

Exposure control is defined as the start of exposure and exposure duration. Exposure control
modes define the method and timing of controlling the sensor integration period. The integration
period is the amount of time the sensor is exposed to incoming light before the video line data is
transmitted to the controlling computer.
The camera can grab images in one of three ways, as described in the following table.
Description
Internal Programmable
Exposure
External Programmable
Exposure
External Trigger Width
Exposure
You determine the three imaging modes using a combination of the Exposure Time Source
parameters (including I/O parameters), Exposure Time and Internal Line Rate parameters.
The feature Exposure Time Source selects the controlling method for the exposure.
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The start of exposure can be driven by an internal timer signal, an external trigger signal, or a
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software function call.
For External Trigger signals, the relationship between an external line trigger and the exposure
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period is only applicable while the external line trigger does not exceed the maximum allowable
line rate.
If the external line rate exceeds the maximum line rate allowed for a mode, the camera will
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continue to output data at its maximum line rate. Though no image artifacts associated with
over-speed will occur, you may notice that under over-speed conditions the image will appear
compressed and the apparent distance travelled will be reduced.
The relevant exposure control features are grouped in the Camera Control category:
Linea CL Series Camera
Line Rate
Internal, programmable
Controlled by EXSYNC pulse
Controlled by EXSYNC pulse
Exposure Time
Internal
programmable
Internal
programmable
External (EXSYNC)
Trigger Source
Internal
External
External
Camera Operation • 33